2021 ICD-10-CM Code A84

Tick-borne viral encephalitis

Version 2021

Not Valid for Submission

A84 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of tick-borne viral encephalitis. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:A84
Short Description:Tick-borne viral encephalitis
Long Description:Tick-borne viral encephalitis

Code Classification

Specific Coding for Tick-borne viral encephalitis

Non-specific codes like A84 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for tick-borne viral encephalitis:

  • BILLABLE CODE - Use A84.0 for Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
  • BILLABLE CODE - Use A84.1 for Central European tick-borne encephalitis
  • NON-BILLABLE CODE - A84.8 for Other tick-borne viral encephalitis
  • BILLABLE CODE - Use A84.81 for Powassan virus disease
  • BILLABLE CODE - Use A84.89 for Other tick-borne viral encephalitis
  • BILLABLE CODE - Use A84.9 for Tick-borne viral encephalitis, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code A84:


Includes

Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.

Information for Patients


Encephalitis

Encephalitis is an inflammation of the brain. Usually the cause is a viral infection, but bacteria can also cause it. It can be mild or severe. Most cases are mild. You may have flu-like symptoms. With a mild case, you may just need rest, plenty of fluids, and a pain reliever.

Severe cases need immediate treatment. Symptoms of severe cases include

In babies, additional symptoms may include constant crying, poor feeding, body stiffness, and bulging in the soft spots of the skull.

Severe cases may require a stay in the hospital. Treatments include oral and intravenous (IV) medicines to reduce inflammation and treat infection. Patients with breathing difficulties may need artificial respiration. Some people may need physical, speech, and occupational therapy once the illness is under control.

NIH: National Institute of Neurological Disorders and Stroke


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Viral Infections

Viruses are very tiny germs. They are made of genetic material inside of a protein coating. Viruses cause familiar infectious diseases such as the common cold, flu and warts. They also cause severe illnesses such as HIV/AIDS, smallpox, and Ebola.

Viruses are like hijackers. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves. This can kill, damage, or change the cells and make you sick. Different viruses attack certain cells in your body such as your liver, respiratory system, or blood.

When you get a virus, you may not always get sick from it. Your immune system may be able to fight it off.

For most viral infections, treatments can only help with symptoms while you wait for your immune system to fight off the virus. Antibiotics do not work for viral infections. There are antiviral medicines to treat some viral infections. Vaccines can help prevent you from getting many viral diseases.


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Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)